研究目的
To synthesize stable single silica-coated CsPbBr3 quantum dots combining tunable red emission of Ag–In–Zn–S for High-CRI white light-emitting diodes.
研究成果
The study successfully synthesized high PLQY and excellent stability of CsPbBr3@SiO2 QDs by a one-step in situ method under room temperature in air. The fabricated WLEDs by combining CsPbBr3@SiO2 with red Ag–In–Zn–S QDs on InGaN blue chips exhibited excellent luminescent performance, including a high color rendering index (CRI) of 91 and power efficiency of 40.6 lm W?1. This method contributes to the development of WLEDs with high efficiency and stability.
研究不足
The study focuses on the synthesis and application of CsPbBr3@SiO2 QDs and Ag–In–Zn–S QDs for WLEDs, but does not explore other types of QDs or alternative applications beyond lighting.
1：Experimental Design and Method Selection:
A one-step in situ method under room temperature in air was proposed to synthesize CsPbBr3 QDs coated with SiO2 (CsPbBr3@SiO2).
2：2). Sample Selection and Data Sources:
2. Sample Selection and Data Sources: CsPbBr3 QDs and Ag–In–Zn–S QDs were synthesized and characterized.
3：List of Experimental Equipment and Materials:
Materials included Cesium Bromide (CsBr), lead (II) bromide (PbBr2), oleic acid (OA), oleylamine (OAm), N,N-dimethylformamide (DMF), 3-aminopropyl-triethoxysilane (APTES), toluene, silver nitrate (AgNO3), indium acetate (In(Ac)3), zinc stearate (Zn(St)2), sulfur (S), n-dodecylthiol (DDT), 1-octadecene (ODE). Equipment included X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectrometer, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV–vis spectrophotometer, fluorescence spectrophotometer, spectrofluorometer.
4：Experimental Procedures and Operational Workflow:
The synthesis of CsPbBr3 QDs, CsPbBr3@SiO2 QDs, Ag–In–S QDs, and Ag–In–Zn–S QDs was described, followed by the fabrication of white LED devices.
5：Data Analysis Methods:
The optical parameters of the fabricated WLED were performed using one spectrograph of PR670 with an analyzer system.
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UV–vis spectrophotometer
UV-2100
SHIMADZU
Absorption spectrum measurement
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Spectrofluorometer
FLSP920
Edinburgh Instruments Ltd.
PL QY measurement
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X-ray diffraction
XRD-6100
SHIMADZU
Characterization of crystal structure
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Fourier Transform Infrared spectrometer
Nicolet iS50 FT-IR
Thermo Fisher Scientific
Analysis of surface functional groups
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Transmission electron microscopy
Libra 200 FE
Zeiss
Morphology and size distribution analysis
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X-ray photoelectron spectroscopy
ESCA Lab220I-XL
Determination of valence states of ions
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Fluorescence spectrophotometer
Agilent Cary Eclipse
Photoluminescence spectroscopy
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Spectrograph
PR670
Optical parameters measurement of WLED
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